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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2016
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2017
Income Tax Disclosure [Abstract]            
Possible decrease in tax expense in next 12 months $ 7.5     $ 7.5    
Taxes paid on cash distribution $ 28.3     $ 28.3   $ 22.1
Effective income tax rate 25.50% 37.90%   35.80% (496.30%)  
Increase in income tax expense $ 6.9     $ 916.0    
Impact of changes in US tax legislation 4.7     20.0    
Increase in income tax expense of federal rate applied to pretax income 8.2     25.3    
Increase (decrease) in differences in tax filings from provision 1.4     (1.2)    
Decrease from reversal of reserves 5.7     0.5    
Decrease in deferred tax assets valuation allowance, amount 1.2     3.3    
Income tax benefit from reorganization     $ 876.1   $ 876.1  
Adjustment of deferred tax assets and liabilities $ 4.7     $ 20.0    
Impact of changes in US tax legislation, as a percent 6.00%     7.10%